Quasielastic neutrino-nucleon scattering and single pion production are important processes in neutrino oscillation experiments. I will show that polarization observables are well suited for studying the axial nucleon form factor, non-standard interaction and testing single pion production models. My presentation bases on the results published in Phys.Rev.D 101, 073002, Phys.Rev.D 97, 013001 and Phys.Rev.D 99, 053002.

Quasielastic neutrino-nucleon scattering and single pion production are important processes in neutrino oscillation experiments. I will show that polarization observables are well suited for studying the axial nucleon form factor, non-standard interaction and testing single pion production models. My presentation bases on the results published in Phys.Rev.D 101, 073002, Phys.Rev.D 97, 013001 and Phys.Rev.D 99, 053002.

Neutrino-induced single-pion production (SPP) provides an important contribution to neutrino-nucleus interaction, ranging from intermediate to high energies. There exist a good number of low-energy models in the literature to describe this process in the region around the Delta resonance. However, their implementation in the Monte Carlo event generators, that are used in accelerator-based neutrino oscillation experiments, is still very limited. I will present a framework exhaustively described in Ref. [J.E. Sobczyk et al., Phys.Rev. D98 (2018) 073001] and its potential to be used for generic and optimized implementations of SPP models. The discussion will be exemplified using the model developed by the Ghent group [R. González-Jiménez et al., Phys.Rev. D95 (2017) 113007] and its implementation in NuWro Monte Carlo generator.

I will discuss my progress in adding the following interaction dynamics to the NuWro package: neutrino-electron scattering in the framework of the Standard Model. This new channel includes six subchannels that differ from each other by the type of initial neutrino or antineutrino. Ten possible final states are produced there in the processes \nu + e -> \nu' + l and \bar\nu + e -> \bar\nu' + l, where charged current, neutral current and their interference are present. Prior to the implementation I made a separate C++ code to generate events from this dynamics and make histograms. First NuWro results for this new channel, visualized by ROOT, will be presented.

In the seminar I will deal with the idea of quantum computing (QC). I will start with a brief description of the idea of quantum information processing, quantum parallelization and its advantage over the "classical" approach and show where it will be potentially useful. What kind of computational problems are already implemented in quantum and how they outperform classical ones. Then I will move to hardware issues and summarize the great problem of QC implementation. I will focus primarily on the solid-state QC, as it is considered to be easily scalable and integrable with classical semiconductor electronics. I will discuss the best qubit implementation techniques (as used in Google and IBM devices) and actual problems with them, as well as other, e.g. "exotic" topological QC ideas where a multi-qubit quantum state is "protected" from decoherence by the electron bands topology. I will finish on describing my own calculations and simulations of qubit proposals in quantum structures with reduced dimensionality, i.e. semiconductor nanowires with strong spin-orbit coupling or quantum dots in graphene like structures:
J. Pawłowski, New Journal of Physics 21, 123029 (2019).
J. Pawłowski, D. Żebrowski, and S. Bednarek, Physical Review B 97, 155412 (2018).
J. Pawłowski, P. Szumniak, S. Bednarek, Physical Review B 94, 155407 (2016)

Semestr Zimowy - 2019/2020

Neutrinos are copiously produced at particle colliders, but no collider neutrino has ever been detected. Colliders, and particularly hadron colliders, produce both neutrinos and anti-neutrinos of all flavors at very high energies, and they are therefore highly complementary to those from other sources. In this talk, I will discuss the recently approved Forward Search Experiment (FASER) at the Large Hadron Collider, which is ideally located to provide the first detection and study of collider neutrinos during the upcoming LHC Run 3 from 2021-23. With mean neutrino energies of 600 GeV to 1 TeV, FASER will measure neutrino cross sections at energies where they are currently unconstrained, will bound models of forward particle production, and could open a new window on physics beyond the standard model. I will also discuss some theoretical uncertainties and challenges in modeling neutrino production and interactions relevant for the FASER experiment.

New model of lepton and quark substructure is introduced, and its possible consequences in particle physics are discussed. In particular, the neutrino masses are predicted to be democratic, which supposes an alternative explanation of several experimental results on neutrinos

New model of lepton and quark substructure is introduced, and its possible consequences in particle physics are discussed. In particular, the neutrino masses are predicted to be democratic, which supposes an alternative explanation of several experimental results on neutrinos

The statistical (thermal) model is applied for the description of hadron yields measured at central nucleus-nucleus collisions at the top RHIC energy $\sqrt{s_{NN}} = 200$ GeV and the LHC energy $\sqrt{s_{NN}} = 2.76$ TeV. In contrast to previous analyzes the more general form of the least squares test statistic is used, which takes into account also possible correlations between different species of yields. When light nuclei are included into fits, the chemical freeze-out temperature about 158 MeV is obtained for both energies (156 MeV when correlations are neglected). Without light nuclei the temperature about 160 MeV is determined for LHC and RHIC when correlations are non-zero, whereas for zero correlations the difference in the chemical freeze-out temperatures between RHIC and LHC is 6 MeV.

The statistical (thermal) model is applied for the description of hadron yields measured at central nucleus-nucleus collisions at the top RHIC energy $\sqrt{s_{NN}} = 200$ GeV and the LHC energy $\sqrt{s_{NN}} = 2.76$ TeV. In contrast to previous analyzes the more general form of the least squares test statistic is used, which takes into account also possible correlations between different species of yields. When light nuclei are included into fits, the chemical freeze-out temperature about 158 MeV is obtained for both energies (156 MeV when correlations are neglected). Without light nuclei the temperature about 160 MeV is determined for LHC and RHIC when correlations are non-zero, whereas for zero correlations the difference in the chemical freeze-out temperatures between RHIC and LHC is 6 MeV.

Neutrino-induced single-pion production (SPP) provides an important contribution to neutrino-nucleus interaction, ranging from intermediate to high energies. There exist a good number of low-energy models in the literature to describe this process in the region around the Delta resonance. However, their implementation in the Monte Carlo event generators, that are used in accelerator-based neutrino oscillation experiments, is still very limited. I will present a framework exhaustively described in Ref. [J.E. Sobczyk et al., Phys.Rev. D98 (2018) 073001] and its potential to be used for generic and optimized implementations of SPP models. The discussion will be exemplified using the model developed by the Ghent group [R. González-Jiménez et al., Phys.Rev. D95 (2017) 113007] and its implementation in NuWro Monte Carlo generator.

Semestr Letni - 2018/2019

17.06.201912:15 (Sala 422) Marzieh Bahman : Computing in physics

In this talk I will discuss the fundamental concepts of Physics computing by addressing two specific aspects of scientific computing: tools and techniques for scientific software and Data Analysis. Tools and techniques dedicated to modern techniques for software design, better understanding and improving the existing software and Data Analysis aspect will be an introduction to data analysis techniques and Monte Carlo method.

Presentation of results achieved by implementing MEC scaling factor which depends on kinematic variables of the event.
Main point is to discuss improvement of chosen quality metrics and way of diminishing them even further avoiding unphysical results.

Hadron cascade model is an essential part of Monte Carlo neutrino event generators that governs final state interactions of knocked-out nucleons and produced pions. It is shown that such model enriched with physically motivated modifications of nucleon-nucleon cross section and incorporation of nuclear correlation effects is able to reproduce experimental nuclear transparency data. Uncertainty of nucleon final state interactions effects is estimated and applied to recent neutrino-nucleus cross section measurements including an outgoing proton in the experimental signal. Conclusions are drawn on a perspective of identification of events originating from two-body current mechanism. [arXiv:1902.05618].

Upcoming neutrino detectors such as SBND will be exposed to very intense neutrino beams and are
predicted to observe thousands of hyperon production events versus the existing dataset of fewer than
100. These processes are of interest as they may be used to identify wrong sign contamination in
neutrino beams, test the quark flavour model and search for time reversal violating interactions.
These processes have been modelled in the NuWro MC event generator with the ability to include
flavour and time reversal symmetry breaking modifications. Interactions between the hyperons and
nuclear material have also been implemented. Some samples of the outputs from the generator will be
presented to examine the effect of the changes to the model on various observables and to look at the
severity of the nuclear effects.

We solve neutrino mysteries by watching them interact with our detectors; most of the
time, they do not even shake hands though. But when they do, the neutrino can acquire an
electric charge and knock things out of the nucleus as it escapes – leaving a crime scene
behind. The traces of the charged lepton and the knock-out are collected by the detector,
and it is our job to identify and count the original neutrinos. So far, this has not been an easy
task: nuclear effects have obscured much of the evidence of the intruding neutrinos, leaving
us complex and seemingly irrelevant information. Not all neutrinos misbehave but,
unfortunately, the neutrinos we care about – those which could possibly tell us about the
creation of the cosmos – all have this modus operandi. To reconstruct the resulting crime
scene, we therefore need a complete understanding of how the nuclear effects work.
Both the charged lepton and the knock-out have partial fingerprints from the original
neutrino, which lie ambiguously on top of the nuclear effect background. It has been found
that these fingerprints can be removed via a novel neutrino CSI technique known as ‘finalstate correlations’. In our recent MINERvA neutrino investigation, this new technique was
used and a detailed reconstruction of the nuclear effects was presented. The underlying
phenomena – such as the initial state of the nucleus, additional knock-out mechanism, and
final-state interactions between the knock-out and the rest of the nucleus – are now
separated. In this seminar, the current status and future prospects of CSI will be discussed.

During my presentation I will present results of the investigation of the polarization transfer observables in the single pion production in
neutrino-nucleon scattering and methods for obtaining them. My presentation bases on the papers PhysRevD.97.013001 and APhysPolB.48.2219.

Semestr Zimowy - 2017/2018

I will present results of the investigation of the polarization transfer observables in the single pion production in neutrino-nucleon scattering and methods for obtaining them. My presentation bases mainly on the paper "Polarization transfer in weak Pion production off the nucleon" and less on the proceedings "Single pion production in neutrino-nucleon scattering studied with FORM package".

Containers allow to encapsulate software with all dependencies - libraries, data, operating system (OS) - into a single executable file. It helps to make your scientific packages ultra portable with a possibility to run them on any machine and any OS. During the seminar I will introduce Singularity containers, which are primarily used by scientific applications users. I will cover the basic concept of a software container and demonstrate how to use, create (interactively and using recipes), and share containers. Finally, I will present Singularity Hub and its integration with GitHub for build automation.

Final state interactions (FSI) play an important role in the description of lepton-nucleus interactions. Nuclear transparency is a measure that allows for a qualitative comparison between FSI models and available experimental data. I will show the methods for a reliable comparison between the data from electron scattering experiments and neutrino scattering Monte Carlo event generators. Then I will present the preliminary results of such tests carried out on the intranuclear cascade model implemented in NuWro.

Semestr Letni - 2016/2017

In this talk, we shall discuss how the S-matrix formalism can be applied to describe the system of hadrons in heavy ion collisions. The approach provides a consistent way to incorporate attractive and repulsive forces between hadrons. Using the input of empirical phase shifts from hadron scattering experiments, the important physics of resonance widths, coupling strengths and unitary constraints are naturally incorporated, beyond the capability of the standard Breit-Wigner formulation. In particular, we show how the proper treatment of the resonance widths can substantially modify the soft part of the pion momentum spectra. Lastly, we shall attempt to extend the approach to include N-body scatterings. For this a generalization of the two-body phase shift will be considered. As a numerical example we compute the generalized phase shifts of some three- and four-body processes for an interacting gas of pions.

In this talk, we shall discuss how the S-matrix formalism can be applied to describe the system of hadrons in heavy ion collisions. The approach provides a consistent way to incorporate attractive and repulsive forces between hadrons. Using the input of empirical phase shifts from hadron scattering experiments, the important physics of resonance widths, coupling strengths and unitary constraints are naturally incorporated, beyond the capability of the standard Breit-Wigner formulation. In particular, we show how the proper treatment of the resonance widths can substantially modify the soft part of the pion momentum spectra.
Lastly, we shall attempt to extend the approach to include N-body scatterings. For this a generalization of the two-body phase shift will be considered. As a numerical example we compute the generalized phase shifts of some three- and four-body processes for an interacting gas of pions.

The MiniBooNE experiment reported results from the analysis of $\nu_e$ and $\overline{\nu}_e$ appearance searches, which showed an excess of signal-like events at low reconstructed neutrino energies with respect to the expected background. A proposed explanation for this anomaly is based on the existence of a heavy ($\sim 50$~MeV) sterile neutrino. These $\nu_h$ would be produced by $\nu_\mu$ electromagnetic interactions, through a transition magnetic dipole moment, and by neutral current interactions on nuclei. A fraction of them decays radiatively inside the detector. The emitted photons are misidentified as electrons or positrons in MiniBooNE.
We have investigated the $\nu_h$ production by coherent and incoherent electroweak interactions on CH$_2$ and Ar targets, present in the MiniBooNE and the Short Baseline Neutrino (SBN) detectors (MicroBooNE, SBND and ICARUS) at Fermilab. Following the $\nu_h$ propagation inside the detector we are able to obtain the energy and angular distributions of the final photons. Within the valid range of model parameters, we have obtained the best-fit parameters to describe the MiniBooNE excess of events. To further investigate this scenario, we have obtained the expected the signal at the SBN detectors. The distinctive shape and total number of photon events from this mechanism makes its experimental investigation feasible.

Reducing neutrino cross-section systematics will be essential to reach the sensitivity goals of current and future neutrino oscillation experiments. The NUISANCE framework has been developed to specifically address this problem by providing a powerful generator tuning framework capable of making comparisons between multiple generators and a broad range of existing neutrino cross-section data. In this talk I will review the framework itself, before discussing its use within T2K to develop a comprehensive set of model uncertainties with current data. I will also highlight the limitations to this sort of approach.

During the seminar I will demonstrate some useful tools for making web pages, presentations, or PDF documents in an easy way by using Markdown markup language. Markdown syntax will be introduced, followed by basic examples of using Pandoc to convert Markdown files to HTML, LaTeX (including Beamer presentations) or directly to PDF. Then, I will present selected applications using Markdown as source files.

Final state interactions (FSI) play an important role in the description of lepton-nucleus interactions. Nuclear transparency is a measure that allows for a qualitative comparison between FSI models and available experimental data. I will show the methods and present the results of such tests carried out on the intranuclear cascade model of the NuWro Monte Carlo event generator.

Many data in the High Energy Physics are, in fact, sample
means. It is shown that when this exact meaning of the
data is taken into account and the most weakly bound
states are removed from the hadron resonance gas, the
whole spectra of pions, kaons and protons measured at
midrapidity in Pb-Pb collisions at $\sqrt{s_{NN}} = 2.76$
TeV can be fitted simultaneously. The invariant
distributions are predicted with the help of the
single-freeze-out model in the chemical equilibrium
framework. The method is applied to the measurements
in centrality bins of Pb-Pb collisions and gives acceptable
fits for all but peripheral bins. The comparison with the
results obtained in the framework of the original
single-freeze-out model is also presented.

In this talk I will sketch the formalism developed by E. Oset and F. de Cordoba in which a semiphenomenological nucleon's spectral function is obtained. Then we will see how it is included into a model of lepton-nucleus interaction. At the end (if time permits), I will analyze how to include the RPA effects on top of the spectral function.

In the first part of my seminar I'll talk about single pion production in neutrino-nucleon interaction. Then I'll make an introduction to FORM - the programming language to symbolic computation, I'll present examples of programs written in FORM and I'll show how I apply it to my work.

MINERvA is a neutrino cross section experiment located at Fermilab. A high-intensity beam is used to study neutrino reactions with five different nuclei. It gives an unique opportunity to study nuclear effects in neutrino-nuclei interactions. The structure of the MINERvA detector and the efforts to estimate neutrino beam will be presented as an introduction to the second part of the talk - the review of MINERvA measurements.

24.10.201612:15 (Sala 422) Kajetan Niewczas : The Contribution of Two-Particle–Two-Hole Final States in Electron-Nucleus Scattering

As an introduction to the topic, the detailed calculation of the electron-nucleus cross section will be presented. The analysis will be performed within three approximations: the impulse approximation, the plane wave impulse approximation and the relativistic plane wave impulse approximation [Nucl.Phys. A632 (1998) 323-362]. This part of the seminar will be finished with a discussion about two-body current interactions and the factorization issues therein. The second part of the seminar will be devoted to the theoretical framework describing the 2p2h final states contribution in the extended factorization ansatz [Phys.Rev. C92 (2015) 024602].

Excited leptons that share the lepton numbers with the Standard Model leptons, but have larger masses, are predicted in the theories of compositeness. I will discuss the bounds on the excited neutrino masses that are still allowed to be of order 1 TeV. Then I will introduce possible generation of the baryon asymmetry of the universe using these new particles. The discussed baryogenesis does not contradict to the small masses of the observable neutrinos and the proton stability.

I will review the derivation of the so-called generalized electromagnetic nucleon form factors. The general structure of the amplitude for elastic ep scattering is constrained only by Lorentz and discrete symmetries (CPT) and it can be expressed by six helicity amplitudes and corresponding complex form factors. During a talk I will introduce physical observables (mostly various polarization observables) sensitive to the generalized form factors.

Many data in the high energy physics are, in fact, sample means. It is shown that when this exact meaning of the data is taken into account and the most weakly bound states are removed from the hadron resonance gas, the acceptable fit to the whole spectra of pions, kaons and protons measured at midrapidity in central Pb-Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV is obtained. The invariant distributions are predicted with the help of the single-freeze-out model in the chemical equilibrium framework. Low $p_{T}$ pions and protons are reproduced simultaneously as well as $p/\pi$ ratio. Additionally, correct predictions extend over lower parts oflarge $p_{T}$ data. Some more general, possible implications of this approach are pointed out.

We give an overview of recent progress made in the description of short-range correlations (SRC) in nuclei. On the experimental side, inclusive A(e,e') and exclusive A(e,e'pN) scattering experiments over the whole nuclear mass range have yielded interesting results about the mass dependence and isospin composition of the nuclear SRC. Especially for the exclusive two-nucleon knockout measurements, theoretical models estimating the effect of final-state interactions (FSI) are indispensable to extract meaningful results from the data. We introduce a model that accounts for these FSI and also discuss a method to count the number of SRC pairs in any nucleus. Comparisons with the existing measurements are made and discussed.

Neutrino-oscillation experiments rely on neutrino-nucleus scattering to detect the neutrinos carrying the oscillation signal. A precise understanding of the mechanisms underlying the interaction of the neutrino with an atomic nucleus is mandatory to disentangle the oscillation pattern.
This quest for the precise determination of oscillation parameters
is complicated by the fact that monochromatic neutrino beams are not available, and neutrinos are produced with a broad energy distribution. The signal in a detector is hence the superposition of different reaction mechanisms : quasi-elastic, multi-nucleon emission, pion-production etc.,
which all need to be understood.
Here, we focus on single-nucleon knockout processes and
present continuum random phase approximation (CRPA) results for charged-current quasielastic (CCQE) neutrino-nucleus scattering at kinematics relevant for the MiniBooNe and T2K experiments. We pay special emphasis to low-energy nuclear excitations that are well described by the CRPA formalism and provide a non-negligible contribution to reaction cross sections for low incoming energies or forward scattering.

In recent studies, several novel variables of transverse kinematic imbalance in neutrino interactions have been proposed and their significance to neutrino energy spectrum reconstruction and nuclear effects was discussed in Refs. [1, 2]. In this seminar, we would like to present the details of our studies with the predictions by the NuWro generator.

During the seminar I will discuss recent results related to neutrino oscillations and the most important challenges that neutrino physicists are currently facing. I will also talk about future experiments that will try to answer numerous important questions, such as what is the neutrino mass hierarchy or whether the CP symmetry is broken in the neutrino sector.

Multipole expansion in non-resonant interaction of single pion production is used for studying resonant and non-resonant contributions and their interference. They will be reviewed technically, from a paper by D. Rein, and a general correction to the model, and a detailed treatment of the lepton mass are going to be discussed.

The review of the Bayesian approach for feed-forward neural networks will be given. The aim is to introduce the basis of the Bayesian statistics and then to show how to adopt this framework for feed-forward neural networks. As an application I will show the extraction of the electromagnetic proton form factors and two photon exchange correction from the elastic ep scattering data. The seminar will have rather informal character.

During an ultrarelativistic central heavy-ion collision the number of produced particles counts in thousands. The matter created at the first stage of such collision reaches extreme values of the density in the volume of the order of the size of a nucleus. This explains the abundance of finally measured particles. To describe the production quantitatively the matter is considered as a statistical system with two independent parameters: the temperature and the baryon number chemical potential. To model the evolution of the matter relativistic hydrodynamics is applied. As an example of this approach, the gold to gold collisions at Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory will be analysed successfully.

NuWro is neutrino nucleus interactions simulation software developed by Wroclaw neutrino group. Currently and affort is being made to incorporate also electron nucleus interactions.
The first electron results will be presented and the plans discussed.

I will present the selected list of problems investigated by some members of the neutrino group during last year. The attention will be concentrated on the presentation of the computational methods, which have been applied.

Semestr Zimowy - 2013/2014

In the first introductory part I will explain what the value of the so-called chi-squared function at the minimum means really. Additionally, I will give reasons why the commonly accepted condition for "a good fit" is that this value should be roughly equal to the number of degrees of freedom. Then I will show that carefree application of this criterion could lead to confused inference. To this end the detailed analysis of the fits to charged particle multiplicity distributions measured by the PHENIX Collaboration in Au-Au collisions at sqrt{s_{NN}}=62.4 and 200 GeV will be presented.

Semestr Letni - 2012/2013

The quick "using git" tutorial will be given, with emphasis on typical usage patterns in nuwro development. The similarities and differences wrt to svn will be discussed. Recovery from common mistakes will be explained. Using git for all personal and group project will be advertised.

The seminar will present fitting procedure using the likelihood function in the
context of the estimate the oscillation parameters. In addition, I will discuss
possible options for improvement by increasing FV SK detector and using p-theta
variables instead of reconstructed energy. Presented results are based on MC
simulation of the muon flux using my own program.

We study full descriptions of production, oscillation and detection process for accelerator neutrinos, in a model independent way by considering possible beyond Standard Model interactions. We present how to describe neutrino production, their oscillation in matter and detection in the case of New Physics interactions. In such case the conventional description of the neutrion oscillation experiments is not sufficient. We examine opportunity to observe influence of non-standard interactions in future oscillation experiments in which nautrinos are produced by pions decay.

Likelihood ratio tests are performed for the hypothesis that charged-particle multiplicities measured in Au-Au and Cu-Cu collisions at $\sqrt{s_{NN}} = 62.4$ and 200 GeV are distributed according
to the negative binomial form. Results indicate that the hypothesis should be rejected in the all cases of PHENIX-RHIC measurements. Possible explanations of that and of the disagreement with the least-squares fitting method are given.

I am going to review computational methods used in calculations of the radiative corrections. I will introduced scalar loop integrals and show how to express given scattering amplitude in terms of Veltma-Passarino integrals. As the simplest example I consider the electron vertex correction. Eventually I consider electron-proton scattering.

A model for single pion production (SPP) induced by lepton-nucleon interaction will be discussed. The model includes the resonant and nonresonat contribution and some description of the second resonance region . We will present predictions of the model for SPP in electron-proton scattering Eventually we will discuss neutrino-nucleon scattering.

We have investigated the coherent production of (anti)kaons in (anti)neutrino-nucleus scattering in the energy range of current neutrino experiments. At the nucleon level, the model incorporates the most important mechanisms allowed by chiral symmetry at lower orders. The treatment of the nucleus is based on the Local Fermi Gas. Kaon distortion is also taken into account by solving the Klein-Gordon equation with realistic optical potentials. Angular and momentum distributions are studied, as well as the energy and nuclear dependence of the total cross section.

Modelling the lepton- nucleus interactions at intermediate energy
transfers of ~100-1000 MeV has been always a theoretical challenge.
The proper understanding of nuclear system dynamics in the above
mentioned energy range is crucial for modern neutrino accelerator
beam experiments, like T2K or MiniBooNE. One of the models, introduced
by the theoretical group of Juan Nieves from IFIC, should cover
most of the possible nuclear system excitations from the quasielastic peak,
through the so-called "dip" region up to the Delta peak. I will give
an overview of this model and present some of my preliminary results
concerning the neutrino- and electron- nucleus scattering.

Pursuing the idea of a possible radiative decay from neutrino mass damped oscillations, the experiment NOTTE searched for new limits on the lifetime of the heavy neutrino radiative decay. The speaker will cover all the essential parts involving the above experiment: the theoretical and experimental approaches, expectations versus results and conclusions. The theoretical predictions for NOTTE were achieved through basic Monte Carlo simulations. To understand why a *basic* Monte Carlo simulation was used and considering the impact of the method in the modern physics, the speaker will introduce the audience to general Monte Carlo simulations, from understanding its basic concept to the modern times development of the method, going through the main problems involving this method and their possible solutions.

Higher order correction in the ep scattering will be discussed. In particular the second order Born correction to the electron scattering off Coulomb potential will be derived. Various possible shapes of the charged distribution inside the proton will be discussed. Then I will evaluate the “box” contribution to the ep scattering, assuming that the intermediate state is given by the virtual nucleon. The theoretical results will be compared with the model independent prediction of the higher order contribution obtained with the neural networks. Eventually I will show the prediction of proton radius.

Wrocław neutrino event generator is in a phase of rapid development. The realistic T2K beam and the detailed geometry of the ND280 near module have been implemented and tested. The rate of generation of unweighted events has increased one order of magnitude. The algorithms which made it possible will be presented and some problems discussed.

Likelihood ratio tests are performed for the hypothesis that charged-particle multiplicity distributions measured in the limited pseudo-rapidity windows of p-p(pbar) collisions at sqrt{s} = 0.9 and 2.36 TeV are negative binomial. Results indicate that the hypothesis should be rejected in all cases of ALICE-LHC measurements, whereas should be accepted in the corresponding cases of UA5 data. Possible explanations of that and of the disagreement with the least-squares method are given.

MINOS collects data from neutrino interactions in two detectors 734 km apart using the Fermilab NuMI beam line as a source of neutrinos. The two detector configuration allows a precise measurement of neutrino oscillations for L/R~500 km/GeV due to comparisons of the energy spectra and beam composition. In the talk I will review recent measurements of oscillation parameters for both neutrino and antineutrino runs.

I will make a review of two of the most sophisticated models of nucleaar dynamics in neutrino-nucleus scattering. The physical input as well as recent results of Nieves and Martini groups will be discussed.

In high-energy approximation one can obtain formula for cross sections for elastic and inelastic scattering of nuclei which depend only on the parameters of the nuclear density distribution. Fitting results to the experimental data one can get information about nucleus. I will present calculations leading to formulas for the scattering amplitude in the case of large nuclei and present results of the numerical computation.

Semestr Letni - 2009/2010

In this seminar I will give an introduction to the modern theory of nuclear forces in its formulation as an effective field theory (EFT) based on chiral perturbation theory. First, I will review the phenomenology of nuclear potentials in nucleon-nucleon scattering and give an introduction to chiral perturbation theory of low-energy QCD. Second, I will explain the concept of an effective field theory in its application to the two-nucleon problem and derive the nuclear force in this context. An outlook is given to chiral EFT for nuclear matter and its applications to neutrino processes in matter.

NOvA experiment is a second generation experiment which will focus on the appearance of the electron neutrino in the muon neutrino produced in the NuMI beamline. NOvA was design as a fully active liquid scintillator detector. A part of the project is an upgrade of the Fermilab NuMI beamline from 400kW to 700kW.
The far detector of the NOvA experiment will be built in Ash River in northern Minnesota to allow the measurement of the matter effects. With a long baseline NOvA will be sensitive to the neutrino mass hierarchy and will extend search of the measurement of neutrino appearance by an order of magnitude beyond current limits. Construction one the detector has begun in 2009 and in 2012 first data is excepted.

Recently, there has been a lot of both experimental and theoretical activity in the area of neutrino interaction in 1 GeV region. In the talk I will report main developments and also mention some unsolved problems. I will also comment on Monte Carlo implementations of the new theoretical ideas.

We start by presenting arguments that the observed asymmetry between the matter and the antimater in the Universe constitutes a challenge for the Standard Model of particle physics. After reviewing briefly the most popular scenarios aimed at explaining the baryon asymmetry (baryogenesis), we discuss in more detail a scenario in which the lepton asymmetry is generated first and the converted to baryon asymmetry (leptogenesis). In the latter scenario there is a possible link between the neutrino mass models and leptogenesis, and we discuss this relation.

Semestr Zimowy - 2009/2010

Internation Design Study (IDS-NF) for the Neutrino Factory leads R&D effort towards the new intensive source of muons based on the muon storage ring. Low and high enery versions of the facility will be discussed together with their physics motivations. The current status of the project concentrating on the conceptual design report in 2012 will be reviewed.

The nature of dark matter is one of the most puzzling questions of astroparticle physics resulting in a large worldwide effort to detect these particles. Overview of the recent experimental situation of direct and indirect searches will be presented. The search for a dark matter induced signal in Super-Kamiokande neutrino data will be covered in more detail.

A good knowledge of neutrino-nucleus interactions in the quasielastic region is crucial for the precise determination of neutrino properties in oscillation experiments. These interactions are also a valuable source of information about the nuclear response in the axial sector and, provided that nuclear effects are under control, about the axial structure of the nucleon. New experimental studies, in particular the large charge-current quasielastic scattering cross section obtained by MiniBooNE, are challenging our understanding of this reaction. I will review some of the present theoretical approaches to this process and possible interpretations of the new experimental results. It is also discussed how the extensive experimental information available on electron scattering can (and should) be used to test and constrain neutrino-nucleus scattering models.

Using high-statistics MiniBooNE CCQE data, the muon-neutrino CCQE differential cross section on carbon is measured. This is the first measurement for the double differential cross section in CCQE interaction, and is the most complete information one can obtain from muon-kinematics-based CCQE cross section measurements. Our measurement can be used to study nuclear effects in neutrino interactions, which is critical input for future long baseline neutrino oscillation experiments.

The natural left action of the spin group on the complexified Clifford algebra allows to treat the elements of some subspaces of the Clifford algebra as spinors. Dirac, Weyl and Majorana basis are found and symmetries of the approach are identified and discussed.

Semestr Letni - 2008/2009

Reactions in which an external probe (an electron, a neutrino, ....) cause a hadron to escape from the target nucleus, play a key role in nuclear and hadron physics. At sufficiently high hadron momenta, Glauber multiple-scattering theory offers an efficient way of dealing with reactions of this type. A relativistic formulation of the theory will be presented. Recent applications include the study of the crossover from hadronic to partonic degree of freedom.

The MiniBooNE experiment has collected an unprecedented number of neutrino and antineutrino interactions in the 1 GeV $E_{u}$ range. Ongoing analyses in both charged and neutral current sectors continue to make progress, particularly in understanding (quasi) elastic and single pion production channels. In addition to 6.5E20 protons on target (POT) acquired with a neutrino beam, MiniBooNE has now also collected 3e20 POT in antineutrino mode. An overview of most recent cross-sections results in MiniBooNE will be given.

The primary goal of the MiniBooNE experiment is to test neutrino mass by searching for neutrino oscillations. The first MiniBooNE neutrino oscillation results published April of 2007 ruled out the simple two neutrino oscillation hypothesis of the LSND experiment. However, MiniBooNE unexpectedly observes a significant excess of electron-like events below a reconstructed neutrino energy of 475 MeV. An analysis of this low energy region for neutrino and anti neutrino modes will be presented.